tenet
TEN-itnounMeaning a principle or belief held as true by a group
Memory hook TEN = HOLD: a belief the club HOLDS. The hiking club’s sign lists the beliefs its members hold to, and number one is “Leave no trash.” Each rule they hold is a tenet.
A basic tenet of the hiking club is to leave no trash behind.
In context Fair play was the central tenet of the soccer league: every child got equal time on the field, no matter the score.
Similar principle, belief, rule, doctrine
From Latin tenet, “he holds,” from tenere, “to hold”: a tenet is a belief a group holds.